Gravity type self-adaptive vegetation retaining wall building block

The utility model discloses a gravity type self-adaptive vegetation retaining wall building block, which relates to the technical field of retaining wall building blocks and comprises a brick body, a planting groove and a first gravel drainage filling hole are arranged on the brick body, and a second gravel drainage filling hole is arranged on the brick body on one side of the first gravel drainage filling hole far away from the planting groove. First positioning pin holes are symmetrically formed in the portions, on the two sides of the first gravel drainage filling hole, of the brick body, irrigation maintenance grooves are formed in the portions, on the two sides of the planting groove, of the brick body, the irrigation maintenance grooves are used for containing pipelines of an automatic irrigation system, and two symmetrical plug pin holes are formed in the planting groove. The irrigation maintenance groove is formed in the planting groove, and a pipeline of an automatic irrigation system can be laid in